Exhaust-valve box of internal-combustion engines



, I H. FILLING. I, EXHAUST-VALVE BOX OF INTEB-NAL COMBUSTION ENGINES.

- APPLICATION Fl LED DEC. 10, {919 g 1,38 3, 147. "Pgitntedfiune 28, 1921.

W2 661926 I five-7a 1 02 UNITED STATES PATENT OFFICE.

HENRY FILLING, OF CEORLTON-GUM-HARDY, ENGLAND.

EXHAUST-VALVE BOX or mrnnnxn-comnnsrron' ENGINES.

T 0 all whom it may concern:

Be it knownthat I, HENRY FILLING, a subject of the King of Great Britain, residing in Chorlton-cum-Hardy, England, have invented certain new and useful Improvements Relating to Exhaust-Valve Boxes of Internal-Combustion Engines, of which the followingis a specification.

The invention relates to exhaust valve boxes of internal combustion engines and more particularly to the means for connecting the inner and outer casings of the valve box to the cylinder.

In a known construction the casing of the valve box is jointed by a flange in the cylinder at the exhaust port of the cylinder and the separate valve seating is also jointed to the cylinder by a flange, the construction being such that any gas leaking past the joint between the valve seating and the cylinderpasses into the interior of the valve box and escapes by the exhaust piping to the silencer and thence to the outside atmosphere.

Consequently, the presence of a defective joint allowing such escape is not immediately made known to the engine attendant. Thus the gas, in its condition of white hot flame, may seriously damage both the inner casing and the adjacent portion of the cylinder.

According to the invention means are provided by which any gas leaking past the joint between the cylinder and the valve seating or inner casing visibly escapes with a whistling noise into the surrounding air instead of into the exhaust box. For this purpose the outer casing of the exhaust box is bolted to the cylinder face by a flange, projections on which engage with the cylinder face, leaving spaces between the projections through which any gas leaking past the joint of the inner casing can pass into the atmosphere. To prevent the exhausted gases from coming back after the exhaust valve has opened, a joint, preferably of soft elastic packing, such as asbestos, is interposed between the inner and outer casings of the valve box and is placed near the junction of the outer casing of the box and the cylinder.

In the accompanying drawings which represent examples of constructions according to the invention, Figure 1 is a central section of the valve box in which the seating is formed in detachable parts as described in British specification No. 108,594. Fig. 2 shows in plan a portion of the flange con- Patented June 28, 1921.

Application filed December 10, 1919. Serial No. 343,832.

necting the cylinder and outer casing of the valve box, and Fig. 3 is a section, similar to F 1g. 1, in which the inner casing is made in a slngle casting.

Referring to Figs. 1 and 2, A is the outer casing of the valve box, B a flange secured to the face of the cylinder C by studs 0. Projections b on the face of the flange B engage with the face of the cylinder and between the projections are spaces 7). D is one portion of the valve seating or inner casing of the valve box, E a separate portlon of the seating and e the joint between the wall of the cylinder 0 and the seating. This joint is made by an inelastic medium such as a copper ring.

Any gas leaking past the joint will pass into a space F between the seating and the cylinder and will then escape through the spaces 6 to the surrounding air.

G is a packing of asbestos or other suitable elastic material which prevents the passage of any exhausted gas from the interior of the valve box.

H is an elastic packing between the lower part of the seating D and the outer casing of the box. The joint 6 should be under pressure and perfectly tight; those at G and II should be elastic in order to allow a slight amount of accommodation which may be required in the distances between the seats of the three joints due to slight differences arising during construction or to relative expansion when the engine is at work.

Joints K between the upper and lower parts of the valve seating D are formed opposite the spaces 6, so that any leakage from the water passages L would be apparent to the attendant. In the arrangement shown, the part E of the valve seating is held in position by the pressure exerted by the part D which is bolted to the flange A by bolts M.

Water may be introduced into and with drawn from the chamber N by pipes 0 passing through the part D.

The same reference letters are used to denote similar parts in Fig. 3 as in Fig. 1, and Fig. 3 differs only from Fig. 1 in that the valve seating D is made in a single piece.

Having thus described the nature of the said invention and the best means I know of carrying the same into practical efiiect, I claim 1. In an exhaust valve box for an internal combustion engine in which the casing of the valve box and the separate velve seetingr are connected to the cylinder by flanged jolnts, spaces provided between the flanges of the casing and the-cylind'erby which any gas leaking past the valve seating joint es: capes directly to the surrounding air, sub stantially as described. I V

- 2. An exhaust valve box according to claim 1 in Which packingis provided: between the inner and outer casings of the valve box in order to prevent'exhansted gas leaking claim 1 inwhich a rigid joint is provided 15 between the cylinder. and. the inner casing of the box and" elastic joints are'provided v respectively near the top and bottom of the outer casing of the box.

In. testimony whereof I have signed my 20 name tothis specification.

HENRY PILL IL'YG. 

